<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <!-- 生产环境中不建议使用 -->
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
    <style>
        .div {
            width: 200px;
            height: 200px;
            background: yellowgreen;
        }
    </style>
</head>

<body>
    <div id="app"></div>
</body>

<script type="text/babel">
    class Hello extends React.Component{
        constructor(){
            super();
            this.state = {
                show:'none'
            }
        }

        render(){
            return (<div>  
                        <input value="change" type="button" onClick={this.change.bind(this)}/>
                        <br/>
                        <div className="div" style={{ display:this.state.show }}></div>
                    </div>)
        }

        change(){
            this.setState({
                show: this.state.show =='block' ? 'none' : 'block'
            })
        }
    }

    ReactDOM.render(<Hello />,app)
</script>


</html>